Sample adding gun capable of preventing liquid return

Abstract

The utility model relates to the field of sample adding guns, in particular to a liquid return preventing sample adding gun which comprises a gun body, a flow blocking assembly is arranged at one end of the gun body, a liquid outlet is formed between the gun body and the flow blocking assembly, a gun head is arranged at one end of the flow blocking assembly, and the flow blocking assembly comprises a flow blocking part and a connecting part. The flow stopping part comprises a mounting cylinder, a movable cylinder, a spring and a sealing plate, one end of the sealing plate is fixedly connected with one end of the spring, the spring is mounted in an inner cavity of the mounting cylinder, the movable cylinder is movably arranged in the inner cavity of the mounting cylinder in a sleeved mode, one side of the sealing plate is fixedly connected with one end of the movable cylinder, and the other side of the sealing plate is fixedly connected with the other end of the movable cylinder. One side of the sealing plate is attached to an opening of the liquid outlet; the flow blocking assembly is arranged on the gun body, liquid is blocked through the sealing plate in the flow blocking assembly, the liquid is prevented from flowing back into the gun body, and supporting force is provided for the sealing plate in cooperation with the arrangement of the spring.

Description

Technical Field

[0001] This utility model relates to the field of dispensing guns, specifically to a dispensing gun that prevents backflow. Background Technology

[0002] Pipettes, also known as micro-adjustable pipettes, are mainly used to accurately transfer small or minute amounts of liquid samples. Due to their ease of operation, high precision, and low error, pipettes are widely used in experimental operations in fields such as biology, chemistry, and medicine, such as PCR sample loading in molecular biology experiments.

[0003] Backflow of solution can easily occur when using a pipette. If the backflowed solution enters the pipette, it can damage the internal components and reduce the lifespan of the pipette. Utility Model Content

[0004] Based on the above description, this utility model provides a sample gun that prevents backflow, thereby solving the problem of easy backflow in existing sample guns.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a sample dispensing gun to prevent backflow, including a gun body;

[0006] One end of the gun body is provided with a flow-blocking component, and a liquid outlet is provided between the gun body and the flow-blocking component. One end of the flow-blocking component is provided with a gun head.

[0007] The flow-blocking assembly includes a flow-blocking part and a connecting part. The flow-blocking part includes an installation cylinder, a movable cylinder, a spring, and a sealing plate. One end of the sealing plate is fixedly connected to one end of the spring, and the spring is installed in the inner cavity of the installation cylinder. The movable cylinder is movably sleeved in the inner cavity of the installation cylinder. One side of the sealing plate is fixedly connected to one end of the movable cylinder, and one side of the sealing plate is in contact with the opening of the liquid outlet.

[0008] Furthermore, the flow-blocking part also includes a flow-blocking cylinder and a filter plate. The filter plate is fixedly installed on the inner wall of the flow-blocking cylinder, and the mounting cylinder is fixedly connected to the filter plate. The inner cavity of the flow-blocking cylinder is conical and gradually increases in size from top to bottom.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the filter plate is designed to be circular, and filter holes are evenly distributed on the top surface of the filter plate.

[0011] Furthermore, the flow-blocking part also includes a baffle, which is fixedly installed on the top of the inner cavity of the movable cylinder, and the cross-section of the baffle is T-shaped.

[0012] Furthermore, the connecting part includes a first connecting cylinder, fins, and a second connecting cylinder. The first connecting cylinder and the second connecting cylinder are fixedly connected, and the outer wall of the first connecting cylinder is threadedly connected to the inner wall of the flow-blocking cylinder.

[0013] Furthermore, the fins are fixedly installed on the side wall of the second connecting cylinder, and the side wall of the fins is uniformly provided with grooves. The second connecting cylinder is used to connect the first connecting cylinder and the gun head.

[0014] Furthermore, one end of the spring is sleeved on one end of the stop block, and the outer wall of the movable cylinder is in movable contact with the inner wall of the mounting cylinder, while the side wall of the spring is in contact with the inner wall of the movable cylinder.

[0015] Furthermore, the sidewall of the sealing plate is fitted to the top of the inner cavity of the flow-blocking cylinder, and the sealing plate is designed as a frustum, with the diameter of the top of the sealing plate being larger than the diameter of the inner cavity of the liquid outlet.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0017] 1. This utility model uses a flow-blocking component on the gun body to block the flow of liquid and prevent the liquid from flowing back into the gun body. In addition, a spring is used to provide support for the sealing plate.

[0018] 2. By setting a filter plate on the inner wall of the flow-blocking cylinder, the mounting cylinder can be supported. At the same time, filter holes are opened on the filter plate to filter when encountering backflow liquid. Impurities are also adsorbed to one side of the filter plate. Combined with the threaded connection between the first connecting cylinder and the flow-blocking cylinder, the first connecting cylinder can be easily disassembled to clean the filter plate. Attached Figure Description

[0019] Figure 1 A schematic diagram of a sample dispenser for preventing backflow is provided for an embodiment of this utility model;

[0020] Figure 2 This is a cross-sectional three-dimensional structural diagram of the flow-blocking component in this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the flow-blocking part in this utility model;

[0022] Figure 4 This is a three-dimensional structural diagram of the connecting part in this utility model.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Gun body; 2. Flow obstruction assembly; 201. Flow obstruction part; 2011. Flow obstruction cylinder; 2012. Filter plate; 2013. Mounting cylinder; 2014. Movable cylinder; 2015. Spring; 2016. Stop block; 2017. Sealing plate; 202. Connecting part; 2021. First connecting cylinder; 2022. Fin; 2023. Second connecting cylinder; 3. Gun head; 4. Liquid outlet. Detailed Implementation

[0025] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0027] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0028] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the technical product is in use. They are used only for the convenience of describing the technology and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the technology. Furthermore, "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. Therefore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0031] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this technology, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0033] Please see Figure 1 and Figure 2 A sample dispenser for preventing backflow, comprising a dispenser body 1;

[0034] One end of the gun body 1 is provided with a flow-blocking component 2, and a liquid outlet 4 is provided between the gun body 1 and the flow-blocking component 2. One end of the flow-blocking component 2 is provided with a gun head 3.

[0035] The flow-blocking assembly 2 includes a flow-blocking part 201 and a connecting part 202. The flow-blocking part 201 includes a mounting cylinder 2013, a movable cylinder 2014, a spring 2015, and a sealing plate 2017. One end of the sealing plate 2017 is fixedly connected to one end of the spring 2015, and the spring 2015 is installed in the inner cavity of the mounting cylinder 2013. The movable cylinder 2014 is movably sleeved in the inner cavity of the mounting cylinder 2013. One side of the sealing plate 2017 is fixedly connected to one end of the movable cylinder 2014, and one side of the sealing plate 2017 is in contact with the opening of the liquid outlet 4.

[0036] A flow-blocking component 2 is installed on the gun body 1. The sealing plate 2017 in the flow-blocking component 2, together with the spring 2015, is used to block the liquid outlet 4 to prevent the liquid in the gun body 1 from flowing back into the interior of the gun body 1.

[0037] Please see Figure 2 and Figure 3 The flow-blocking part 201 in this embodiment also includes a flow-blocking cylinder 2011 and a filter plate 2012. The filter plate 2012 is fixedly installed on the inner wall of the flow-blocking cylinder 2011, and the mounting cylinder 2013 is fixedly connected to the filter plate 2012. The inner cavity of the flow-blocking cylinder 2011 is set in a conical shape and gradually increases in size from top to bottom.

[0038] A filter plate 2012 is installed inside the flow-blocking cylinder 2011 to filter the return liquid, thereby removing impurities from the return liquid and preventing impurities from entering the flow-blocking cylinder 2011 and sticking to the inner wall of the flow-blocking cylinder 2011, which would affect the movement of the sealing plate 2017.

[0039] Please see Figure 2 and Figure 3 In this embodiment, the filter plate 2012 is designed to be circular, and filter holes are evenly provided on the top surface of the filter plate 2012.

[0040] Please see Figure 2 and Figure 3 In this embodiment, the flow-blocking part 201 also includes a baffle 2016, which is fixedly installed on the top of the inner cavity of the movable cylinder 2014, and the cross-section of the baffle 2016 is T-shaped.

[0041] A stop 2016 is provided in the inner cavity of the movable cylinder 2014 to facilitate a certain limiting effect on the spring 2015.

[0042] Please see Figure 2 and Figure 4In this embodiment, the connecting part 202 includes a first connecting cylinder 2021, a fin 2022, and a second connecting cylinder 2023. The first connecting cylinder 2021 and the second connecting cylinder 2023 are fixedly connected, and the outer wall of the first connecting cylinder 2021 is threadedly connected to the inner wall of the flow-blocking cylinder 2011. By making the first connecting cylinder 2021 and the flow-blocking cylinder 2011 threadedly connected, it is easy to turn the first connecting cylinder 2021 to separate the first connecting cylinder 2021 and the flow-blocking cylinder 2011, and the filter plate 2012 on the flow-blocking cylinder 2011 can be cleaned.

[0043] Please see Figure 2 and Figure 4 In this embodiment, the fins 2022 are fixedly installed on the side wall of the second connecting cylinder 2023, and the side wall of the fins 2022 is uniformly provided with grooves. The second connecting cylinder 2023 is used to connect the first connecting cylinder 2021 and the gun head 3.

[0044] Please see Figure 2 and Figure 3 In this embodiment, one end of the spring 2015 is sleeved on one end of the stop block 2016, and the outer wall of the movable cylinder 2014 is in movable contact with the inner wall of the mounting cylinder 2013, and the side wall of the spring 2015 is in contact with the inner wall of the movable cylinder 2014.

[0045] The movable cylinder 2014 is sleeved with the spring 2015 so that the spring 2015 can be in a limited state when compressed, thus preventing the spring 2015 from tilting to the left or right.

[0046] Please see Figure 2 and Figure 3 In this embodiment, the sidewall of the sealing plate 2017 is fitted with the top of the inner cavity of the flow-blocking cylinder 2011, and the sealing plate 2017 is designed as a frustum, with the diameter of the top of the sealing plate 2017 being larger than the diameter of the inner cavity of the liquid outlet 4.

[0047] The sealing plate 2017 fits against the inner wall of the flow-blocking cylinder 2011 to seal the liquid outlet 4. As the sealing plate 2017 moves, there will be a gap between the sealing plate 2017 and the flow-blocking cylinder 2011, which facilitates the exhaust of the gun body 1.

[0048] In actual use, when the gun body 1 is venting, the air pressure will push the sealing plate 2017 to compress the spring 2015, causing the sealing plate 2017 to move downward. At this time, the liquid outlet 4 opens, and the liquid enters the second connecting cylinder 2023 under negative pressure. Afterward, the spring 2015 will automatically return to its original position, so that the sealing plate 2017 re-seals the liquid outlet 4, preventing the liquid from flowing back into the inner cavity of the gun body 1.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sample dispenser for preventing backflow, comprising a dispenser body (1), characterized in that: One end of the gun body (1) is provided with a flow-blocking component (2), and a liquid outlet (4) is provided between the gun body (1) and the flow-blocking component (2). One end of the flow-blocking component (2) is provided with a gun head (3). The flow-blocking assembly (2) includes a flow-blocking part (201) and a connecting part (202). The flow-blocking part (201) includes an installation cylinder (2013), a movable cylinder (2014), a spring (2015), and a sealing plate (2017). One end of the sealing plate (2017) is fixedly connected to one end of the spring (2015), and the spring (2015) is installed in the inner cavity of the installation cylinder (2013). The movable cylinder (2014) is movably sleeved in the inner cavity of the installation cylinder (2013). One side of the sealing plate (2017) is fixedly connected to one end of the movable cylinder (2014), and one side of the sealing plate (2017) is attached to the opening of the liquid outlet (4).

2. The sample dispenser for preventing backflow according to claim 1, characterized in that, The flow-blocking part (201) further includes a flow-blocking cylinder (2011) and a filter plate (2012). The filter plate (2012) is fixedly installed on the inner wall of the flow-blocking cylinder (2011), and the mounting cylinder (2013) is fixedly connected to the filter plate (2012). The inner cavity of the flow-blocking cylinder (2011) is set in a conical shape and gradually increases in size from top to bottom.

3. A sample dispenser for preventing backflow according to claim 2, characterized in that, The filter plate (2012) is designed to be circular, and filter holes are evenly provided on the top surface of the filter plate (2012).

4. A sample dispenser for preventing backflow according to claim 1, characterized in that, The flow-blocking part (201) also includes a baffle (2016), which is fixedly installed on the top of the inner cavity of the movable cylinder (2014), and the cross section of the baffle (2016) is T-shaped.

5. A sample dispenser for preventing backflow according to claim 1, characterized in that, The connecting part (202) includes a first connecting cylinder (2021), a fin (2022), and a second connecting cylinder (2023). The first connecting cylinder (2021) and the second connecting cylinder (2023) are fixedly connected, and the outer wall of the first connecting cylinder (2021) is threadedly connected to the inner wall of the flow-blocking cylinder (2011).

6. A sample dispenser for preventing backflow according to claim 5, characterized in that, The fin (2022) is fixedly installed on the side wall of the second connecting cylinder (2023), and the side wall of the fin (2022) is evenly provided with grooves. The second connecting cylinder (2023) is used to connect the first connecting cylinder (2021) and the gun head (3).

7. A sample dispenser for preventing backflow according to claim 1, characterized in that, One end of the spring (2015) is sleeved on one end of the stop block (2016), and the outer wall of the movable cylinder (2014) is in movable contact with the inner wall of the mounting cylinder (2013), and the side wall of the spring (2015) is in contact with the inner wall of the movable cylinder (2014).

8. A sample dispenser for preventing backflow according to claim 1, characterized in that, The sidewall of the sealing plate (2017) is fitted with the top of the inner cavity of the flow-blocking cylinder (2011), and the sealing plate (2017) is designed as a frustum. The diameter of the top of the sealing plate (2017) is larger than the diameter of the inner cavity of the liquid outlet (4).

Images